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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39e6bd1d253646819c70f26b0bd9c007f571a4025045a0e1f561698b628630aa' 
  AND token = '6bT+Kd91dP9QPTmMK6JRIfqG5eRND5rTW0WrhQ/J6BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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