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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6fe8d9c2257ded3e064ce13ef5c075521232f91d3ffea9dbc2ac38d13330d80' 
  AND token = 'E4m5IfZ/04XaGheQyMpV0EO3xNySVGLF69UNOEkaIeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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