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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f8e36e7d2c36bdcd5816820771661c0bd72b15a805bb895c8d295bac6bd0feb' 
  AND token = 'vAW0KgkCvtwBcXzBVFzM8/B8V1oiu1CaN43N4NtsiNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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