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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bdf71c8faf5d78ef274e9714e513ee2df5be0dd680f57ad0d4a2c7965c42868' 
  AND token = 'ESgQIdwfMQ2z9w22tbzG6eU0InOrF/km4+hLQ2xqn5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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