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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '075eb9cccc4def771b2a078c698836d5afd781760012605be78e6a2bf584c2fd' 
  AND token = 'cV12QV9frpyrZYSlAXOcRmViP8rxyWCrCCbqOBUujgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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