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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9db2ac199bfad8213660bfa693735f92b3ad80dbbbba451a0a2f073a0e5efa2c' 
  AND token = '00H9bu/6poijYgCMJzr/8mic5rsIxwey5sAgdIq4QWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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