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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76a86436a1a85e79f2ce7ac2df44d4cd1c6d57a7794da183a042c68a377af4c0' 
  AND token = 'SQhLNsg8HQ7iIOzDVGaYRg8JY9r2OFHvVaAB/13guaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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