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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cde5282d94a1fd20b7410190d47c4256f715236fe8631251fd109856239409ea' 
  AND token = '8RoyPwqe4PNIuripXomfZWlMzzn9f4yX75Tja3IAHQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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