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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '707b430c1229333891e80becba923849bd73286a2a02a1a486be452aea0febc6' 
  AND token = 'kfS2q4iAq5/53FZtjFpd6b6NgH/uQ3ipG1ciqgCh97g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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