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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbf494a365961c9c1658e048c414753d22333f9cc2adabfa18c212acfddfd8eb' 
  AND token = '96Mi90KcYuPRX+cvqaLonsQ6CBTpNMlmC2737u1nT+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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