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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '987eb0c026a22a96568c90e5c43e261e884bb826b2faac3df03e5b91f49ba741' 
  AND token = 'YE/dXdb4S8sl0tLiXo5hIvTtoFAf+lnK8f7pP2Q9BDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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