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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e0cf8b2ef5eab44f2404103e4c9b014d3583f49ddc8f4a902155f8b6ee8e912' 
  AND token = 'C2DumfKWOOQf9A831jM2kkOYz4BChYK9PqEzDLF5iJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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