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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf2d1552fc3176df432d0f0eb5be65140f338059d86df75bd4a71a5c1f1ce75b' 
  AND token = 'Nzz1wFWSnEK010jMOzM70rzOdgkuPsYIeq4spkBxDzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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