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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83b5a3b79d92e13deb4d0d213e63442d32272b3b16a5ad85c0105f11a0f909e7' 
  AND token = 'cO2chmHwZx+LnH8zLHw4P0VnkxE21oEbAZrpRVYtZ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00180

JSON explain

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