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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84a4a21e3209e99fbd294f84e5c2b04ce172a05e86f3a0250e6d333ddd0c710d' 
  AND token = 'JKil5jZhZigsGtFiCBuzTjCfPC2ALAXP41ioOAoplpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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