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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fa7c8e0a56861b941604555e9507ef65f025c1564f7dc7154a4b8b677b7ed0f' 
  AND token = 'R282pjABqZr5XZnUGGjqSR9Wuh50Ek9eI7/KJdrnW4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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