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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35da8e86c8bfd0dbdf3930253b77b808492cde08fe69a6b32035027e7374592d' 
  AND token = '03c3tdRcuvtclRX5psrXnpik9Qy+p5FioyDbmIRNJ4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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