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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '989ce0bb11d7d078d9b78cef7090f9dc45fc02b9b5f912f4791407c7076ad477' 
  AND token = 'ygFCXbti6C8FZSAbTbFjmCmHbvLstXHSLpKWa81406c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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