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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '836c3e8f157ff876744ebb2a07e2688613e1fccb4f8926449695d63a435845ae' 
  AND token = '+pBAdqXG78s/iOCH8blD/2k167w66UUM6XgpiH7pOOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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