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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df1100dfd7cb4f544eaf6ef5b0abb7c329e744a91be5edcb14735a1647f19761' 
  AND token = '6kfV2VIpWoT90C00Saorp8p72N2GlrnWNpi60MPitpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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