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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50a17add987cac18702b5954a16f830fa1b517987a55a0163801800efd60659e' 
  AND token = 'WfkYbCt7gb0q0blp2NeZ5OfG6moMI+ZPFdDBjYhsrFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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