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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3036113f66b4d5022ffc9a4a543f2da660d7bcadb4b7694f765b86cdc166e48' 
  AND token = 'vheKvFRv/eKYIyEKiNdsb3Q4TTOtzR17W6YPnPT4h58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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