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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7143bfac04931a480ad0b21baafd235975e9543893bf8b8a0da4b1f833b90d25' 
  AND token = 'b8wb11RyHPx9JQaNwgKpJz7bsVbNCOkfIMwgMT2kbD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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