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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a345565b9a5a9f568bb6644f9b4e7f2fb2cac68d9f80886617854b3636ae9f1' 
  AND token = 'MBYDasBLEiPKpW4g8Kzp2Xi0hxFv9rmf083orJyNFOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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