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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1ac399da4c74b24ee5824c5dc41fab2636c1604692021be84a69723bdc1c699' 
  AND token = '/Wji2z5vJTxkk1KHNeHw+DCXc0g5UlFdaGCkipkEjEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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