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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65d735502f5940be061c6f8dc789558a872d85549f7473a7b6500799f5e75efa' 
  AND token = 'o+xNr0QF/6PHAtlIV67DlpzFzz/ycNNlJZkJuThP5QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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