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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d87fad117e1fbc1f41123b08eb24535b825496cf5117d125104fe73132f3a27' 
  AND token = 'igxEP496cZvLaaN2pJ2Lw97efwx1J19lENhE5ztJ4/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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