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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '551dc34c2eafda6ccd2231ea96ee750bd3b46f3166f71ff22664983186f82b27' 
  AND token = 'kReZ7kogvBZpSmLV6CN0o59Hrp4mbij0Z0U+NqpcFRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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