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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9714199a5a0b4f9fc59c5f2a31e32bf8910741629112273726b40cce148f6cf4' 
  AND token = '/L9jAY90rmO5mSxfbA0G3ZkqP3zW87BkNWnOjfD2C1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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