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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c8a0efa1fc4901fe2c79a1968bea1c49302d77a6f3437b4eae8b0f79cf59293' 
  AND token = 'ZZ7OzbtxHzfRvysvG/X2pDycV0oU63NiEROC135HdxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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