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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6f976a83a86181a62a09ce2c422aa0c58304bbee69f3e3679f2a4ddfc0adb59' 
  AND token = 'iWoe354GCtPWGm+rpfH0W25jHDGJcu9YLjm14JzGq78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}