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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77e06f9884eb344185185cc7e83df94e109658458cea362dea6316714a111f52' 
  AND token = 'wMbLqmu3S47qBj98CJdgCCl7lJ1WREDol1UA+M/0WiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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