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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cde61dd1f3a73793874d5f2ea0cf95c4556af6a80f477d52c235a1525bc55f4' 
  AND token = 'L4gxCU/+xTxidkTKuSZ09CPE8vrSIvjWsp6W2igAITE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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