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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27f7d67e734c44456e9797baf4bccd0f76d42f57a9b4e3c6434aeab5fa693e10' 
  AND token = 'ZWk03VYUBq0BGTdAS96L57TKxKISEMyJDY2CbJBInh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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