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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f18958d6e383bf00cc1e768713e65de92a532f5a6d08ef2b8a4765f532e3d88' 
  AND token = 'Q8JadRMKEjKtzdwrY9Ct7amVMXfWN3yfGAx55ZK5yqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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