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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a4898d9f5beae680c27cdc99ff02df7df0be8bd337ecf7b7703e542b3036616' 
  AND token = 'c3OaOaj7Udn95rZWz7lPByfnh1a0CeVYXk0MOT5cCww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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