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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '107ac7febfab8e1f92dbc9c8550c06495400d3d1f342084228a3e8555bc8de52' 
  AND token = 'bhhNOBMcBGWB3JG6VT6MNbDDW5YU5+EFhSIWYETaE0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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