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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54f6b128ce3b8cc89c41aa45e52e66fb48d4ec0e477a5a2fe429f2bd5922a97e' 
  AND token = 'sKnYrl8P9PABCrzo97EL6Zr83QpJeH03ay7TRrASNh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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