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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1018883ab81f1e9a38fdc4e31e730f36af6128632505fae2e4bf4d4095837cb0' 
  AND token = '8TfsjUlg8OlpUUjIWLy4SaAbocKt2FaanZaczPigX10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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