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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ce4be0a8136b52e862d47c9400df2b04b7c36daffed1a92b279d9d122ced17a' 
  AND token = 'cGztdo3yYeP4YX5nLcx9Z3ynn0lTgA8l9xGhz5iRy9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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