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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f393f0e77fb26a306d3b53a7d05f0a93db5c44b050a95e2b43180890ee1a0b87' 
  AND token = 'xPkwmfkeYW5BR+y0RJeSAPdc4/QaPN7CrZdRCpApmi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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