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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b965a0cd0bd004c2bf7e009ab421c0f27081303d230cab3ceeae2ca0398c3009' 
  AND token = 'luaJ+ypvgyaDxDSqHrf1RzQNfiui8XCYOOE/RRQP6TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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