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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80929e926feaf2be7143af0bdce56613303e0ae5500a2d33de5ff4b9930c151a' 
  AND token = 'dhjNwoK3JQc1G+XIs6FwDpEaa3DhBx37sQY2y8utW6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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