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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '010b7673178ec386bddc691bdf0580483f5ea9ed4473242f67d23aa0c0954d3c' 
  AND token = 'lgAZDWuGVyKGgNAtp/zuALGfDIIkgoKSeQA8opdp9a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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