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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eaa2dc5ed0ae4850a8d29a38f126c3ca166dfa3821193e3c9b782dfe2d12c4c' 
  AND token = 'KY9eRm4yV1E1a9AeYOX2EhjB00D49mUPHNSuL67Im/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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