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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd64ac3e62d11020b4aeaea976fbafca9e716bbf256330995445eb7b3dbc2a973' 
  AND token = 'idb/Up7bzBEQ0OBjoRBbacddg0T5pZ1QjvIe0J2OXwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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