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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d1bb1b617f28285836ae50c483c62bdd00a67e71e5a32a8ed6fee55cc5a7f60' 
  AND token = 'pWJO22JtElqyIKOpDaXFVDKdW4PJkx1Ta6eXo40vieE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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