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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cf843308a753a8d4e52ce20252d52eba0110e0c494582e0f310bd02d7c3e3d5' 
  AND token = '7RSb6HrL/y8PLUMzKvtLeb/h6gX/cjYrjsbI5cq6Hqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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