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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd68b964a389533f50ff8407d13f31676a39c9172d49325215f7114b97b91384a' 
  AND token = 'oZMPkjYETi/RTA+mbCpdNGeEee0xnDCaj55AiyGTrA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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