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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e47bf4c3809f6731acf347e2c725cc35641589d9225c95b010bd004a684ab82' 
  AND token = 'SiFogcIQHbhH7EWtJ7f7vTaYgObacKsM54KDkiA9XaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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