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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed1d8ea839750178afba935c87c05ab1c86433d547f4602e3400b02b532fd587' 
  AND token = 'PqSKhM83kxEmaxB++kV+fmGwURMQsy4A0ie9iDn4+8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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