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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ba6b85d11b6d4f1c50d0fc347f2fdf21ec9de64bf28ee348bb14328f45dc75b' 
  AND token = 'jhRVAvUd3T0VEzWedcnmyQjg37rRgAS33nO10FbWLbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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