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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00c0ec0209a2c199fc3471fef388ee7da8d3b35f20ec0792202dbd4a5143792b' 
  AND token = 'yHoxazl7jAWEG0GnC8Z8LVDGqGPLvEiR9oFdyHTnOXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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