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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '629494f542ba5f55f29f480993dd09417de36695103db24d9b6d297da6436fce' 
  AND token = '61dWizS3+/od0Ay7KddaaNTcRlWMbZrkbCcHm0pvCcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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