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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af007e1879a517b2582b808b7136c2bb32a44f2430e0b62fb35c0fccdee40f53' 
  AND token = 'INmJ3CYjFN5fwfGi7wb2lsHTIauC+CYpqXIv11BJ42E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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