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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1561936a5dea772a58d364ce2942a69e9bba153a058cbd5565eaf6d1677cf95' 
  AND token = '5I0sFlTh7aKQgTTeBMTMSM0leOgKKjMhNJbalx4VyXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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