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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f57363a21d1beac15954209ce2ec3386ea59faf6cc6aadc4c79b053a7e22df0' 
  AND token = 'Qw8wu/j64BE5Ko5/P11dTtn8y5ccrzZlLcCkPFKO0KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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